Hantavirus symptoms often start with flu-like signs such as fever, chills, and muscle aches. People may also feel tired and have headaches or dizziness. After a few days, symptoms can get worse and affect breathing. This stage is called hantavirus pulmonary syndrome and can become serious quickly. Some people also experience nausea, vomiting, or abdominal pain early on. The illness can progress fast, so early medical attention is important. Overall, symptoms can go from mild to severe in a short time.
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